UX audit finding. The catch-up alert demanded $X/mo without
accounting for pledges the user had already recorded. The user
recorded a $20k pledge → catch-up still demanded a fresh $20k →
double-counting → stacked yellow CTAs telling them to do the
thing they'd just done.
Goal#catch_up_delta_money now subtracts `open_pledges.sum(amount)`
from the demand:
delta = max(monthly_target − pace − sum(open_pledges), 0)
Uses the in-memory preloaded `open_pledges` collection (controllers
already eager-load it), so no extra query. The clamp at zero keeps
"$0/mo more" from rendering when pending pledges fully cover the
gap.
Alert branch in show.html.erb now also gates on
`@goal.catch_up_delta_money.amount.positive?` — when the demand
zeroes out via pending pledges, suppress the alert entirely.
Status pill stays `:behind` (because `pace < required`), but the
action surface goes quiet because the user already took it.
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